Form for hollow concrete walls



March 27, 1956 E. T. GABRIELSON 2,739,363

FORM FOR HOLLOW CONCRETE WALLS Filed Oct. 12, 1951 2 Sheets-Sheet 2 5 z:E E 1' 1 i; :5 5 'l 1 ii :i 40 fl /A//Z E z if :f I I: 2 5? F: M i E?ii Q 1 g! :5 1 J A? #76 3 A76. 4. /G .5

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" INVENTOR EL ME? 7'. Gayle/5450 7/flm /jmwz mm 1 ATTORNEYS UnitedStates Patent FORM FOR HOLLOW CONCRETE WALLS Elmer T. Gabrielson,Yacolt, Wash. Application October 12, 1951, Serial No. 250,980

3 Claims. (Cl. 25-131) This invention relates to concrete forms, andmore particularly to an improved concrete form assembly especiallysuited for forming building walls.

The main object of the invention is to provide a novel and improvedconcrete form assembly for use in molding building walls and the like,said assembly being simple in construction, being easy to erect, andproviding improved cast wall features, such as uniform distribution ofthe aggregate through the wall elements, the provision of vertical,spaced hollow portions in the wall to provide economy in utilization ofthe concrete and heat insulation, and provision for forming door andwindow openings.

A further object of the invention is to provide an improved concretemolding form for casting wall elements of buildings, the concrete formassembly involving inexpensive components, being easy to set up, beingeasy to remove after a wall has been cast, and being durable inconstruction.

Further objects and advantages of the invention will become apparentfrom the following description and claims, and from the accompanyingdrawings, wherein:

Figure 1 is a top view of a typical section or a concrete wall moldconstructed in accordance with the present invention.

Figure 2 is a side elevational view of the concrete wall mold section ofFigure 1.

Figure 3 is a vertical transverse crosssectional view taken on the line33 of Figure 2.

Figure 4 is a vertical transverse cross sectional view taken on the line4-4 of Figure 2.

Figure 5 is a vertical transverse cross sectional view taken on the line:35 of Figure 2.

Figure 6 is a fragmentary longitudinal vertical cross sectional viewtaken through the upper portion of a section of concrete wallillustrating the manner in which the form clamps may be removed from themold assembly at the conclusion of the wall forming operation.

Figure 7 is a perspective view of the carrier bar employed in Figure 6.

Referring to the drawings, the concrete form assembly is designatedgenerally at 11 and comprises the longitudinally extending spacedparallel vertical plates 12, 12 which are secured at their verticalmargins to the upstanding arms 13, 14 of respective form clampassemblies of the type fully described in my copending patentapplication Serial No. 191,168, filed October 20, 1950, and entitledConcrete Form Clamps. As is fully described and illustrated in theaforementioned copending patent application, the clamping assembly issupported by vertical stud bars 15, and the plate members 12, 12 aresecured to the vertical arms of the clamping assemblies. The clampingassemblies include horizontally extending top bars 17, and horizontallyextending intermediate bars 18, 13 which are notched to allow thevertical reinforcing bars 21) to extend upwardly therebetween, said bars21) passing between the top horizontal bars 17, 17, as shown in Figure6.

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The improved concrete form assembly includes bulkhead members 21disposed wherever it is necessary to terminate the wall being cast, asfor example at doorways, window openings and the like. Each bulkheadmember 21 comprises a transversely extending top angle bar 22 to theintermediate portion of which is secured a depending plate 23 arrangedto fit closely between the longitudinal form wall plate 12, 12 andextending substantially to the bottom plane of the form, as shown inFigure 5. Secured to the outer ends of the top bar 22 are the depending,vertical angle bars 24, 24 arranged to engage the outer surfaces of theform plates 12, 12 and to maintain the bulkhead 21 in its correcttransverse position with respect to the main longitudinal form plates12, 12. Secured to the depending plate 23 at its intermediate portion isthe vertical channel strip 25 which is intended to serve as a core forforming a vertical groove in the end of the concrete wall, said verticalgroove being provided for the purpose of receiving portions of thewindow or door framing structure to be mounted in the wall opening beingthus formed. The bulkheads 21 are also provided at their ends withvertical fillet elements 26, 26 to provide rounded corners in theconcrete wall blocks formed thereby.

Longitudinally disposed between successive form clamp assemblies are aplurality of cavity forming structures 27 adapted to form regularlyspaced vertical cavities in the wall to provide heat insulation and toreduce the amount of concrete required to form a wall of given size.Each core structure 27 comprises a first transverse supporting bar 28formed at its ends with right-angled bearing elements 29, 29 adapted toengage on the top edges of the form wall plates 12, 12, as shown inFigure 4, and a second bracket structure 30 including the respectivespaced side bars 31, 31 on the opposite sides of the core structureformed at their top ends with hooks 32 adapted to engage over thetransverse top rod 17 of a form clamp assembly, as shown in Figure 3.The bars 31, 31 are connected by transverse arms 33, 34 and securedbetween the bars 31, 31 below the arm 34 is the longitudinally extendingcore plate 35. The opposite end of core plate 35 is secured to theintermediate portion of the cross bar 28 and is thus supported on thetop edges of the form plates 12, 12.

Secured to the intermediate portions of the arms 33, 34 is the verticalbar element 36 formed at its top por-- tion with the hook 37 adapted tobe employed as a handle for raising the core assembly and removing sameafter the wall has been cast.

The core plate 3'5 is tapered downwardly so as to facilitate the removalof the plate from the wall at the conclusion of the molding operation.Each core plate 35 is formed with a plurality of vertical slots 39opening at the bottom edge of the core plate, said slots 39 being evenlyspaced and defining vertical depending core elements 40 therebetween.Said core elements 40 are hollow, to lighten the core plate 35 and arevented at their top ends by vertical passages 41 connecting the upperportions of the internal cavities of the vertical core ele ments withthe top edge of the core plate 35.

The purpose or" the vent passages 41 is to prevent the formation of avacuum inside the hollow core element 40 when the core plate is beingremoved at the completion of the wall casting process, whereby removalof said core plates is facilitated. It will be understood that thebottom ends of the internal cavities of the core elements 40 are closedsince the bottom edge of the core plate 35'engages the bottom supportingsurface on which the form is mounted.

In forming a wall, the assembly is arranged, as shown for example inFigure 1, with the bulkheads 21 in place and with the core plates 35arranged between and parallel to the wall plates 12, 12 and supported attheir ends in the manner above described. With the form in as sembledposition, the concrete may be poured, and after the concrete has set,the core plates 35 may be removed by lifting them out of the form,employing the handles 37 as described above. The form clamps may then beremoved in any suitable manner, as for example in the manner describedin the above identified copending application, or by the use of acarrier bar shown in Figures 6 and 7. The carrier bar, designated at 42,comprises an elongated handle 43 having the opposing yoke bars 44, 44secured to an end thereof, said yoke bar being connected by a transversepin on which is pivotally mounted the depending hook element 45. Pivotedto the ends of the bars 44, 44 are the link bars 46, 46, and pivotedbetween the ends of the link bars 46, .46 is the hook member 47 whichfaces laterally, as shown in Figure 7. The book member 47 is providedopposite its hook portion 48 with the handle portion 49. In using thecarrier bar 42, the lower hook member 45 is engaged with one of thetransverse top bars 17 of the form clamp and the hook element 48 isengaged around the upstanding reinforcing bar 20 in the manner shown inFigure 6. The axis of the opening in the hook element 48 is inclined atan acute angle with respect to the axis of the hook member 47, wherebythe hook element 48 may exert a frictional clamping action on thereinforcing bar 20 when the member 47 is rotated upwardly. The operatortherefore holds the handle 43 with one hand and the handle 49 with theother hand, exerting upward force on the handle 49 to clamp the hookmember 47 to the rod 20, and then exerts upward force on the handle 43,whereby an upward pull is transmitted to the form clamp assembly throughthe hook member 45, lifting the form clamp assembly and therebyfacilitating its removal: from the form. The form clamp assem'idy may,of course, be disengaged from the form by other means such as describedin the aforementioned copending patent application, the details of saidmeans for disengaging the form clamp forming no part of the presentinvention While a specific embodiment of an improved concrete formassembly has been disclosed in the foregoing description, it will beunderstood that various modifications within the spirit of the inventionmay occur to those skilled in the art. Therefore, it is intended that nolimitations be placed on the invention except as defined by the scope ofthe appended claims.

What is claimed is:

1. In a concrete form, a pair of spaced parallel vertical plates, bracemeans connected to the plates and arranged to support said plates invertical parallel position, respective transverse bulkhead membersdisposed between said plates, each bulkhead member comprising atransverse top bar slidably engaging and being horizontally movable onthe top edges of said plates, a depending rectangular bulkhead platesecured to said top bar and fitting transversely between said firstnamed plates, respective vertical depending guide bars of substantiallength secured to the 4 ends of said top bar and slidably engaging theouter surfaces of said first named plates, a vertical core platedisposed centrally between said first named plates and being arrangedparallel thereto, a first transverse support member secured to the topedge of said core plate at one end thereof and engaging the top edges ofsaid first named plates, a transverse bar at the top end of said bracemeans, and hook means at the top edge of the core plate at the other endthereof engaging said transverse bar, said hook means comprisingupwardly projecting, spaced hook elements secured to and locatedoutwardly adjacent the opposite sides of said core plate.

2. In a concrete form, a pair of spaced parallel vertical plates, aclamp assembly engaging the opposite outer sides of said parallelvertical plates, a transverse bar at the top end of said clampsassembly, a vertical core plate, disposed centrally between said firstnamed plates and being arranged parallel thereto, a first transversesupport member secured to the top edge of said core plate at one endthereof and engaging the top edges of said first named plates, and hookmeans at the top edge of the core plate at the other end thereofengaging said transverse bar, said hook means comprising upwardlyprojecting, spaced hook elements secured to and located outwardlyadjacent the opposite sides of said core plate.

3. In a concrete form, a pair of spaced parallel vertical plates,respective transverse bulkhead members disposed between said plates,each bulkhead member comprising a transverse top bar slidably engagingand being longitudinally movable on the top edges of said plates, arectangular depending bulkhead plate secured to said top bar and fittingtransversely between said first named plates, and respective verticaldepending guide bars of substantial length secured to the ends of saidtop bar, said hook means comprising upwardly projecting, spaced hookelements secured to and located outwardly adjacentthe opposite sides ofsaid core plate, and slidably engaging the outer surfaces of said firstnamed plates, a vertical core plate disposed centrally between saidfirst named plates and being arranged parallel thereto, a firsttransverse support member secured to the top edge of said core plate atone end thereof and engaging the top edges of said first named plates, aclamp assembly engaging the opposite outer sides of said parallelvertical plates, a transverse bar at the top end of said clamp assembly,and hook means at the top edge of the core plate at the other endthereof engaging said transverse bar, said core plate being formed witha plurality of vertical slots opening at the bottom edge of said coreplate and defining depending arms therebetween, said arms being hollow,the top walls of said arms being formed with relatively small verticalpassages to allow air to enter the arms when the core plate is removed.

References Cited in the file of this patent UNITED STATES PATENTS

